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Abstract. Chemical modification of natural rubber (NR) has frequently been attempted to improve the performance in specific application. 30% poly (methyl metacrylate) grafted NR (MG 30) has been explored as a potential candidate for polymer electrolytes. The complexation effect of LiCF3SO3, ethylene carbonate (EC) and A12SiO5 in polymer host electrolytes has been investigated using FTIR ICP-OES spectrometry. Thermal studies of the systems have displayed a stable trend of glass temperature transition at elevated salt concentration whereas incorporation of EC and filler into the system results in the same pattern in their Tg values.

Abstract. Gel polymer electrolytes consisting of 49% PMMA grafted polyisoprene-LiCF3SO3, were plasticized with propylene carbonate (PC) are reported. The effect of PC on the electrochemical properties of the polymer electrolyte has been investigated. Analysis of FTIR spectra shows the interaction of salt and plasticizers with the polymer chain. The ionic conductivity was measured and exhibited a maximum value of 104 S/cm. The temperature dependence of the electrical conductivity follows the Arrhenius law.